Identify the metal which is not common to German silver and brass.
Identify the metal which is not common to German silver and brass.
Cu
Zn
Fe
Ni
Solution
Composition of German silver is
Zinc $(Z n)=$ about $35 \%$
Copper $(\mathrm{Cu})=$ about $50 \%$
Nickel $(\mathrm{Ni})=$ about $15 \%$
While brass contain mainly :
Zinc ( $\mathrm{Zn} \sim 30 \%$ ) and copper ( $\mathrm{Cu} \sim 70 \%$ ) and some quantity of nickel (Ni).
Therefore, metal nickel (Ni) is not common to German silver and brass.
Hence, option (d) is the correct answer.